Ore sizer and classifier.



No. 678,55l. Patented luly I6, l90l. J. U. DIMMICK. ORE SIZER ANDCLASSIFIEB.

(Application led July 9, 1900.) (No Modal.)

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FFllCEt JOSEPH O. DIMMIOK, OF DENVER, COLORADO, ASSIGNOR TO THEDIMMIOKOONOENTRATING COMPANY, OF SAME PLACE.

@RE SIZER AND CLASSIFIER:

sPEciFI'cATIoN forming part of Letters :Patent No. 678,551, dated July1e, i901.

Application nea muy e, 1900.

To all whom t may concern,.-

Be it known that l, JOSEPH O. DIMMIOK, a citizen of the Unit-ed States,residing at Denver, in the county of Arapahoe and State of Colorado,have invented a new and useful Skimming Device for Ore Sizers andClassiiiers, of which the following is a specification.

This invention relates to that class of oreseparators in which thepulverized ore is classified through the agency of water-such, forinstance, as shown in my prior patent, No. 653,568, granted July 10,1900.

The object of myinvention is to provide a skimming device for carryingoff the slimes which accumulate upon the surface of the water in sizersand classifiers of the type referred to.

The invention will be more fully described hereinafter with reference tothe accompanying drawings, in which the same is illustrated as embracedin a convenient and practical form, and in which- Figure l is alongitudinal vertical sectional view showing my device as applied to asizer and classifier. Fig. 2 is a plan view of my device removed fromthe sizerand classifier, and Fig. 3 is a vertical sectional viewthereof.

Similar reference characters indicate the same parts in the severalfigures of the drawings.

The sizer and classifier with which my present invention is illustratedin Fig. l is fully shown and described in myprior patent previouslyreferred to and will therefore be only briefly described here in orderthat the operation of my improved skimming device may be understood.

A tank,preferably V-shaped in cross-section, is provided with a trough Nor other suitable inlet,through which the pulp from the stamps orpulverizer is delivered. Across the center of the tank isk located apartition G, near the bottom of which is an opening provided withavertically-sliding gate. The size of the opening may be regulated bysliding the gate up or down by means of a rod extending from the gate toa point above the tank. At approximately the center of the gate isinserted a tubular coupling or nipple having a valve J located therein..A rod H2 is operatively connected to the valve J and extends up- SerialNo. 23,035i (No model.)

` Wardly above the top of the tank, permitting ready adjustment of theopening through the coupling. A iiexible pipe K, slightly longer thanthe distance from the gate to the end 5 5 wall` of the tank to admit ofthe free adjustment of the gate, extends from the coupling in the gateto a nipple projecting through the end Wall of the tank. A valve L isprovided in the nipple on the outside of the tank. A 6o series oftransverse partitions divide the bottom of the tank into a number ofchairnbersM, each of which is provided with a dischargeoutlet M2,passing through one of the side walls of the tank, near the bottomthereof. These partitions are preferably of a height substantially equalto the portion ofI the center partition below the opening therein. The

end of the tank is provided with an overflowspout N2. 7o

Reference letters A indicate vertical posts forming part of theframework for supporting the tank.

My present invention comprises an attachment for conveying the slimesfrom the surface of the water to the exterior of the tank, where theymay be delivered to a table orconcentrating device. In the form of myinvention illustrated I provide a skimmer which nfloats upon the surfaceof the water and which 8o is provided with a central opening below theWater-level. A iiexible pipe leads from such central opening to theexterior of the tank, which in the sizer and classifier shown in Fig.

l may be accomplished by connecting the pipe with the coupling or nipplewhich passes through the adjustable gate in the central transversepartition G.

The details of the skimming-disk are best illustrated in Figs. 2 and 3,in which O indicates a rim projecting upwardly from a bottom C5, whichis preferably concave. Holes O2 are provided in the rim vC at suitableintervals, and an opening C3 is formed in the center of the bottom C5. Anipple C4 pro- 95 jects downwardly from the opening C3, to which iscoupled one end of a flexible pipe D, the other end of which leads tothe exterior of the tank, or, as shown in Fig. l, to

the nipple extending through the adjustable ma gate.

A table or support E, having legs E2, is

preferably though not necessarily placed upon the bottom C5 of theskimmer over the opening C3. The table E is adapted to support a weightF, which is of such size as to submerge the openings C3 below thewaterline, (indicated by letter Bin Fig. 1.) The table is preferablyopen at the top to permit weights being added or removed to give theexact weight required.

The operation of my invention is as follows The pulp is discharged intothe tank, and the slimes,which are too light to be drawn down by thedownward current, accumulate upon the surface of the water. Thesefloating slimes then pass through the openings in the rim of theskimmer, and thence through the opening inthe bottom of the skimmer tothe pipe, from which they are discharged to a separate table orconcentrating device. The volume which may be drawn off through theskimmer may be regulated by varying the weight F, so that the openingsC2 will be more or less ysubmerged, or by plugging up some of theopenings O2 to produce the desired amount of inflow. The conduit or pipeD being longer than the distance from the gate to the surface of thewater allows the skimmer to adjust itself upon the surface of the waterto any point to which the current may carry it. The slimes and skimmingdevice being controlled by the same influence will always be at thesame'point upon the surface of the water.

Although I have illustrated my present invention as applied to thesiz'er or classifier covered by my prior patent, itis equally applicableto other ore sizers and classiers of the washer type. I do not wish tobe understood as limiting myinvention to the more or less precise fromsand details described, as I contemplate changes in form, the proportionof parts, and the substitution of equivalents as circumstances maysuggest or render expedient Without departing from the spirit of myinvention.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is

l. In combination with an ore-classifier, a skim ming-disk adapted tooat, and comprisof the skimmer may be governed, substantially asdescribed.

2. In combination with an ore-classifier comprising a tank divided intochambers by a partition, a gate in said partition, a iexible conduitpassing through said gate and one of the end walls of the classifier,and connected yat its other end to a skimmer in the first chamber, saidskimmer comprising a bottom, perforated rim, and a table supported bylegs over the central exit and adapted to receive weights to regulatethesubmergence of said skimmer, substantially asdescribed.

3. In an ore-classifier, the combination with a skimming device, adaptedto oat, comprising a bottom having an outlet-opening therein, and anupwardly-projecting rim surrounding the bottom, and haviuginletperforations therethrough, of means for adjusting the weight of saidskimming device whereby its submergence may be governed, and theposition of said inlet perforations relative vto the water-line Vsoadjusted that the desired volume of liquid may be drawn olf through theskimming device, substantially as described..

4:. In an ore-classier the combination with a tank having outlets, ot' afloating skimming device, means for adjusting the Weight of saidskimming device, a conduit leading from said device to the exterior ofthe tank, whereby the heavier particles of ore pass through the saidoutlets in the tank, while the slimes which accumulate on the surface ofthe Water are drawn off through the conduit leading from the skimmingdevice, the volume of such slimes drawn off being determined by thedegree of submergence of the skimming device, substantially asdescribed.

JOSEPH O. DIMMICK.

W'itnesses ORvILLE L. DINEs, HELEN E. KENNEDY.

